A coepoea



Reissued Apr. 21, 1925.

MAURICE F. BERNSON, F CANADIAN, TEXAS, ASSIGNOE, BY

ol-Flcl-z.`

HESNE ASSIGNMENTS,

'ro WALKER MANUFACTURING coMPANY, or RACINE, wIsooNsxN, A couronn- TION0F WISCONSIN.

JACK.

Original No. 1,488,723, dated March 11, 1924, Serial No. 484,111,.1lledJuly 12, 1921. Application for reissue led December 17, 1924. Serial No.756,626.

means for extending the same to ift or lower' the load. Another objectof the invention is to provide the telescopic parts with screw threads land to provide a rotary nut which engages one member with means forholding said -member against rotary .movement so that.

the rotation of the nut will move the same lon itudinally and means forpermitting the U sai member to rotate at the ends of its longitudinalmovement,'so that it willcause `the second member to move longitudinallywhile being held against rotary movement byj the load. I A still furtherobject of the invention 1s to provide means for rotating the nut on boththe upward and downward movement of the handle.

Another object of the invention is to make the handle in sections andeach section so formedas to be capable of use as a tire tool.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts, to behereinafter fully described, illustrated in the' accompanying drawingsand specifically `pointed out in the appended claims. Y

In describing my invention in detail, reference will be had to theaccompanying drawings wherein like characters denote like orcorresponding parts throughout the several views, and in which- Fig. 1is a side view "of the jack in closed position, parts being shownin'section.

Fig. 2 isa view of the parts in extended position.

Fig. 3 is an enlarged sectional view ofthel standard. y

Fig. 4 is a section on lme 4-4 of Fig. l.

Figs. 5, 6 and 7 are detailed views.

5-5 of Fig. 4.

the other pair at the lower Inthese views l indicates the standard orbody part of the jack which is preferably formed of two halves, suitablyconnected together. This standard is provided with a bore 2 which hasits ends enlarged, as at 2. The bore has 4longitudinally extendinggrooves 2" formed 1n its wall which are arranged diametrically oppositeeach other and sloping shoulders connect the end'walls of the grooveswith the enlarged ends of the bore. A base bottom of the standard andcloses the lower end of the bore thereof. A rotary nut 4 is rotatablymounted in the upper end of the standard )by ,having its flange 4engaging the annular groove 4 formed at the top of the standard. A screwthreaded member 5 is normally seated in the bore and passes through thenut and a second screw threaded member 6 is normally seated in themember v5 and has its screw threads engaged by the plate 3 is connectedwith the interior screw threads 5 of member. This second member 6carries the load supporting head 7 at its upper end, said head beinformed with the usual concave recess. pin 8 is transversely arranged inthe lower part of member 5 and this pin has its ends projecting and lisadapted vto engagev the grooves 2 in the standard to movement of member5, but when said pin is located in the enlargements 2 of the bore itwill be free to turn with the member. As the pin leayes the groove itwill engage the `inclined walls of the extensions 2 and will ride upthese walls until it reaches the circular parts of the enlargements. Itwill be noted from Figs. 3 and 5 that these pairs of inclinedl wallsleading from grooves 2"- to the circular enlargements 2 each extendthroughout `half ofthe circumferencmof the bore, that is, one pair ofinclined walls meets when cularenlargement 2. 2 In this way the rotationof nut 4 is reversed, the ends of pin 8 will engage with certain ofthese inclined` walls and be guided back into the grooves .2.

It will thus be seen that when the nut is pin '8 is in eitherenlargement of the bore with qthe nut and Fig. 5 is a section takensubstantially on the line vbe causedl to move longitudinally by thescrew threads 5 on member 5. If the pin 8 prevent rotary I ments.-

is in the grooves l2", however, member 5 will be held against rotarymovement so that the rotation of the nut will cause said member 5 tomove longitudinally until the pin leaves the grooves and enters one ofthe enlarge- The means a frame 9 pivotally secured to the standard andadapted to be rocked by a handle 10.

The pivots of this frame carry a pair of bevfeled gears formed on thenut.

11 which mesh with teeth 12 A pair of crescentshaped dogs 13 arepivotally mounted in the.

frame-and are adapted to engage with thel gears 11. Each dog is providedwith a pair of rearwardly extending ears 14 between which is arranged aU-shaped spring 15 and which is suitably connected with the dog. Theouter 4end of the frame is made. in the form of a socket 16 and a sleeve17 is rotatably mounted in said socket. The inner end of this sleeve isprovided with a 'pair `of arms 18 which taper towards their outer ends.These arms pass throu h slots 19 formed in the projections 2O o? theframe and which support the inner ends of the pivot pins of the dogs.The extreme ends of the arms 18 engage the U`shaped springs `15 so thatwhen thesleeve 17 is partly ro- -3'0ftated in the socket said arms bytheir enagement with the spring 15 will cause the ogs to rock upon thelrpivots, one in one direction and the other in an opposite direction, sothat the upper end of one dog will engage the teeth of one of the gears11 while the lower end of the other dog will engage the teeth of theopposite gear. Thus the rocking movement of the frame will move one gearon Iits upward stroke andthe other gear` on its downward stroke and asthese gears engage opposite si es of the nut, said nut will be moved onboth strokes of the Yis frame. The spring 15 will permit the dogs toratchet over the teeth of the gears when idling. p arms 18 and thesleeve17.

The handle 10 is made in sections, eachV section having a'wedge-shapedend 10' which is adapted to engage a slot 10" in the enlarged end of thenext section, a similar slot 17' being formed in the sleeve 17 forreceiving the wedge-shaped end of the first section of the handle. Byplacing the wedge-shaped end of the first section in the slot in thesleeve and partly rotating it the dogs can be moved to place them inproper position to either raise thefjack or lower the same. It will beseen that the peculiar shape of the handle sections will.render themcapable of being used as tire tools.

In operation, the jack is placed under the i part to be elevated,preferably with one of for rotating the nut compriseswretated intheproper direction by manipu- Slots 19 limit the movement of theagainstrotation by the load supported thereon. If at this time sleeve 5 ispartially elevated, so that the ends of pin 8 are in engagement with thegrogves 2, sleeve 5 will thus be Iheld against rotation and will beelevated through gear 4, when gear 4 is lation of-the handle 10. Therewill at first be no relative rotation between the inner screw 6 and thescrew'sleeve 5, and. these two screw members will move bodilyupwardtogether, carrying the load which is sup-- ponted by the head 7. Whensleeve 5 nears the upper limit of its travel, the ends of pin 8 will-runout into theenlargements 2 of the bore, wherein they can rotate, andwill eventually come in contact with the lower face of gear 4, lockinglthe sleeve 5 and gear 4 together to turn as a unit. The sleeve 5 nowacts as a rotary nut withk inner threads 5', to further elevate thenon-rotary screw G, and the lifting operation will be continued until.the load is sufiiciently elevated, or until both screws are completelyextended.

On the other hand, if at the beginning of the elevating operation,sleeve 5 is "completely lowered with the ends of pin 8 in the lowerenlargement 2', the sleeve 5 vmay at first turn with the gear 4, andelevate the screw 6, and the load carried thereby, until this inner.screw 6 is completely extended,

whereupon theslecve 5 will be held from tary gear 4. 'l` he ends of pin8 will iinmedi atcly encounter thev inclined walls of the extensionl andbe guided into grooves 2".- If the frictional resistance of screw 6 inthreads 5 in sleeve 5 is greater than the resistance or' the threads onsleeve 5 in gear 4, the sleeve 5 will be held against rota-tion at' thestart of the operation just described above suiiciently to cause the pin8 to ride up the inclined extension into grooves 2', after which theoperation is as first dcscribed. Y t

For the lowering operation, handle 10 is manipulated to cause rotationof gear 4 in vthe opposite direction, and an exactly reverse movement ofthe screws takes place. As long as the inner screw 6 is held againstrotation bythe loa'd or other means, the screws 5 'and 6 will -besuccessively lowered to the desired extent, or until both areconipletely housed within the standard. As in the elevating operation,it is quite immaterial which screw is lowered first, -this cle-- pendingupon the relative resistance to turnlng of the two screw and nutengaging portions. 't n From the above it will be apparent that when theparts are in closed position the jack'twill be small soas to take up butlittle rooni in the tool boxand also render it capable of beingplacedunder parts which are f of which are utilized tol impartmovement'- 'close to the surface upon which the jack is seated. It willalso be seen that the jack can -be extended to a'considerable extent sothat it will raise the load to agreat hei ht and the movement of theparts is secure by the rocking movement of the frame, both strokes tothe parts. v

AIt is thought from the foregoing 'description that the advanta es andnovel features-.of my invention will be readily apparent.

I desire it to lbe understood that I may make changes in theconstruction and in the combination and arrangement of the sevl eralparts, provided that such changes fally within the scope of the appendedclaims. l

I claim: y 1. A jack of the class described comprising a standardhavinga bore therein and vertical grooves in the walls of the bore, ythe ends.of the bore being of larger diameter than the major portion thereofwith sloping shoulders connecting the enlargements with the walls of thegrooves, a nut rotatably connected vwith the top of the standard, a.screw threaded member located in the bore of theq'standa-rd and passingthrough the nut, a projection at the lower end of the 30member forengaging the grooves to prevent rotary movementof the member until theprojection reaches the enlargements, ratchet meansfor rotatingathe nut,asecond screw l threaded member located in the tirst member and havingscrew threads thereon, the first member being interiorly screw threadedvto receive the second member and a sup-v porting head on the upper'endof the second member, Y I,

2. `A jack of the classdescribed comprising a standard formed of' twohalves bolted together, a base bolted td the lower end of the standard,the upper end of the standard having an annular groove formed therein,

a nut having a ange thereon engaging the..

groove, said standard having a bore therein, the ends of which areenlarged and each half of the standard havinga longitudinally extendinggroove therein and sloping shoulders connecting the end walls of thegrooves with the enlarged part of' the bore, a screw threaded memberlocated in the bore and passing throughhe nut, a projection on themember for engaging the grooves to prevent rotary movementof the membersuntil-the projectionv reaches enlargements, a second screw threadedmember located in'the first member and said first member having screwthreads lthereon for engaging the screw threads of the second-member,ratchet mechanism engaging the nut and a handle vtor actuating theratchet mechanism.

3.' A. lifting jack' comprising a standard having a vertical bore and avertical groove in the walls of the bore, the ends ofthe bore being oflarger diameter than-the inainbore with sloping shoulders connecting theenlargements with the walls of the groove, a

nut rotatably supported at the top of the standard, means for rotatingthe nut, a screwthreaded member located in the bore ofthe standard andmeshing within the nut,

a projection at the lower end of .the member for engaging the groove toprevent rotary movement of the member until `the projection reaches oneof the enlargements, a second threaded member mountedwithinthe firstmember which is internally' threaded to receive the'second member, and aload supporting head on the second member.

4. A lifting jack comprising a standard having a vertical bore andavertical groove lso in the Walls of the bore, one end of the bore beingof larger diameter than the main bore with sloping shoulders connectingthe enlargement with the Walls of the groove, a

nut rotatably supported at the top of the standard, means for rotatingthe n'ut, a screw-threaded member located in the bore of the standardand meshing within the nut, a projection at the lower end ofthe member'for engaging the groove to prevent notary movement of the member untilthe.- projection reaches the enlargement, a second threaded membermounted within the first memberwhich is internally threaded to receivethe second member, and a load supx porting head on the second member. v

5. A lifting jack comprising a hollow standard, a rotatable interiorlythreaded driving member mounted in the standard, an exteriorly threadedsleeve meshing vwithin, the driving. member and having an interiorly7threaded nut inits upper portion, a load-supporting screw meshing withinthis nut,l and means lpositively preventing rota' tion of the sleevethroughout its longitudinal travel through the driving member irre'-spective of the load carried by the screw but permitting it t-o rotatewith the driving member when at the upper ,limit of its travel. 6. Alifting ack comprising a hollow standard, a rotatable interiorlythreaded driving member mounted in the standard,

an exteriorlx threaded sleeve meshing within the driving member andhaving an interiorly threaded nut-in its upper portion, a

screw meshing Within this nut, and means l positively preventingrotation of vthe -sleeve throughout itslongitudinal travel through .thedriving member irrespective of the load carried by the screw butpermittingit to ro.

tate with the driving member when at the lower limit of its travel.

A7. A lifting jack comprising a hollow standard, a' rotatable interiorlythreaded .driving member mounted in the standard, van exteriorly thre'ided sleeve meshing within the driving memberI and .having .aninteriorly threaded nut in its upper portion, a 1,30

screw meshing within this nut, and means positively preventing rotationof the sleeve throughout its longitudinal -travel through the drivingmember irrespective of theload carried by the screw but permitting it torotate with the driving member when at the upper and lower limits'of itstravel.

8. A lifting jack comprising a' hollow standard, a rotatable interiorlythreaded driving member mounted in the standard, an exteriorly threadedsleeve meshing within the driving member and having an interiorlythreaded nut in its upper portion, a screwaneshing within this nut, andmeans positively preventing rotation of the sleeve throughout itslongitudinal travel-through the driving member irrespectiveof the loadcarried by the screw but permitting it to rotate with the driving memberwhen at the upper and lower limits of its travel, and means for lockingthe sleeve dto the driving member to turn therewith when at the limitsof its vertical travel.

9. In a lifting jack, a vertically movable lifting member, means forraising and lowering the member, and guiding means posi- -tivelypreventing rotation of the member about its own axis while moving up' ordown, and permitting rotation-.thereof only when at either the upper orlower limits of its travel. f

10. In a lifting jack, a vertically movable lifting member, meansforraising and lowering the member, and guiding means positivelypreventing rotation of the member about its own axis while lmoving up ordown, and permitting rotation thereof only when at the upper limit ofits travel.

11. A lifting screw comprising a standard, a rotatable driving member, apair of lifting. screws one nested within the other, the outer screwbeing threaded within the driving member, the inner screw moving bodilywith the outer screw when the latter is being raised or lowered, andmeans for positively enforcing a vertical movement of the inner screwthrough the outer screw, when the outer screw is at the upper or lowerlimits of its movement and the inner screw is in engagement with a load.l

12. In a lifting jack, a hollow standard, a lifting member verticallymovable through the standard, guiding means projecting from the liftingmember, cooperating. guiding means in the standard for preventingrotation of the lifting membei` during its vertical movement through thestandard, the guiding means in the standard terminating shortv of theupper and lower-.ends of thev standard whereby the lifting member ispermitted to rotate when at the limits of its travel in eitherdirection.

13. In a' lifting jack, a hollow standard, a lifting member verticallymovable through the standard, guiding means projecting from inpho thelifting member, cooperating guiding means in the standard for preventingrotation of the lifting member-during its vertical movement through ,thestandard, the guiding means in the standard terminating short of theupper and lower ends of the standard whereby the ,lifting member ispermit-ted to rotate when at the limits of its travel in eitherdirection, and means in each end of the standard directing the guidingmeans on the lifting member into engagement with the guiding means'inthe standard when the direction of travel of the lifting member isreversed. Y l

14. In a lifting jack, a hollow standard, a lifting member verticallymovable through the standard, guiding means projecting from` the liftingmember, cooperating guiding nieansiin the standard for preventing rota-Xtion of the lifting member during its vertical movement through thestandard, the guiding means in the standard terminatingl shortl of theupper end of the standard whereby the lifting member is permitted `torotate when completely elevated.

15. In a lifting jack, a hollow standard, a lifting member verticallymovable through the standard, guiding means projectingfrom the liftingmember, cooperating guiding means in the standard for preventingrotation of the lifting member during its ver- 'tical movement throughthe standard, .the

guiding means in the standard terminating l short of the upper end ofthe standard whereby the lifting member is permitted to rotate whencompletely elevated and means in the upper end of the standard for'directing the guiding means on the lifting member into engagement withthe guiding means in the standard when the lifting member is lowered.

16. In a lifting jack, a hollow standard, a lifting member verticallymovable through the standard, guiding means projecting from the liftingmember, cooperating guid-v ing means in the standard for preventingrotationv ofthe lifting member during its vertical movement through `thestandard, the guiding means in the standard terminating short of thelower end of the standard, whereby the lifting member is permit- ,ted torotate when completely lowered, and' means in the lower end of thestandard for directing the guiding means on the lifting member intoengagement with the guiding means inthe standard when the liftingmemberis again elevated.

17. In a lifting jack,a thebore of which is 'provided with a verticalguide slot communicatin with an enlarged portion of the bore a jacentthe upper end of the, standard, aF lifting member vertically movablethrough the standard, and a pin extending from the lifting memberandmoving in the -guide slot to prevent hollow standard, ,i

. rotation of the lifting member while moving vertically, but rotatingfreely 'in rthe enlarged portion .of the bore when the lifting member is'completely elevated,

` 18. In` a lifting jack, a hollow standard, the bore of which isprovided with a verti-` cal guide slot communicating with an enlargedportion of the bore adjacent the upper end of the standard, a liftingmember vertically movable through the standard, a pin extending fromthe'lifting member and moving in the guide' slot'to prevent rotation ofvthelifting member while moving A vertically, but rotating freely in 4theenlarged portion of the bore when the lifting member is Icompletelyelevated, and means within the vstandard for directingmhe pin intol theguiding slot when the lifting member is again lowered.

19. In a lifting jack, a hollow standard,

the'bore of whichis provided with a vertical guide slot communicatingwith an. en-v larged portion of the borel adjacent the lower end of thestandard, a lifting member-vertically movable. through the standard, apin extending from the lifting member and moving in the guidel slotfto'pi'e-v vent rotation of the lifting member while moving vertically`but rotating freely in the enl'arged portion of. the bore whenthellifting member is completely lowered, and

' means within the standard for directing the pin into the guide slotwhen the' liftin member is again elevated.

20. In a lifting jack, a hollow standard, the bore of which is providedwith a vertical ide slot `communicating with enlarged portions of thebore adjacent the upper and lower ends of the standard, a lifting mem-Iber vertically movable through the standard, a pin extending from thelifting member and moving in the guide slot to prevent rotation of thelifting member while moving vertically, the pin being adapted to rotatefreely with the lifting member in the enlarged portions of the-.borewhen the lifting member is completely raised or lowered.

21.. In a lifting jack, a hollow standard, the bore of\which is providedwith a vertical guide slot communicating with enlarged portions of thevbore adjacent the upper and ower ends* of the standard, alifting membervertically movable throughpthe standard, a pin extending from thelifting member and moving in the guide slot to prevent rotation of thelifting member while moving vertically, the .pin being adapted to rotatefreely with the lifting member inY the en; larged portions of the borewhen the lifting member is completely raised or lowered and means withinthe 'standard for directf ing the pin into the guide slot when the liftiing member is again moved vertically.

22; A lifting jack comprising a hollow standard, a rotatable interior-lythreaded an exteriorly threaded sleeve meshin .within the driving memberand having an 'nteriorly threaded portion in its upper end, a screwmeshing within this latter threaded portion and vadapted to carry theload to be lifted at its upper end, a pin projecting from vthe `lowerportion of the sleeve, the bore of the standard having" a vertical slotin which the pin travels during the/vertical movement of the sleeve,there being an enlarged portion of the bore adjacent the upper end ofthe standardl in whlch the pin can freel rotate after leaving the slotwhereby the sleeve may rotate with the driving member after beingcompletely evated.

23. A lifting jack comprising `a hollow standard, a rotatable interiorlythreaded driving membe mounted in -the.sr tandard, an exteriorlythreaded sleeve meshing within the driving member and havinganinteriorly threaded portionin its upper e'nd, a screw meshing withinthis latter threaded portion and, adapted to carry the( load to belifted at its upper end. a pin projecting from thev lower portion of thesleeve, the bore of the j standard having a vertical slot in which theversely rotated to lower the sleeve.

24. A lifting jack comprising a hollow A standard, a vrotatableinteriorly threaded driving member mounted in the standard, anexteriorly threaded sleeve meshing within the driving memberand havingan interiorly threaded portion inits upper end, a screw meshing withinthis latter threaded portion and adapted to carry the load to be liftedat its upper end, a pin projectin from the lower portion of the sleeve,the ore of the standard havin pin travels during the vertical movementof the sleeve, there being an enlarged portion of the bore ad'acent thelower end of the a vertical slot in which the standard in which the pincan freely rotate after leaving the slot wherebyjthe sleeve may rotatewith the driving member after being completely lowered.

25. A /lifting jack comprising a hollow standard, a rotatable interiorlythreaded driving member'mounted in the standard, an exteriorly threadedsleeve meshing within the driving member and having an in- Vteriorlythreaded portion in its upper end,

a screw meshing within this latter threaded y portion and adapted tocarry the load to be lifted at its up er end, a pin projecting from thelower portion of the sleeve, the bore of 13 the standard having `a.vertical slot which l the pin travels during the vertical movement ofthe sleeve, there being an enlarged portion of the bore adjacent thelower end of the standard in which the pin can freely rotate afterleaving the slot whereby the sleeve may rotate with the driving memberafter being completely lowered, and means within the standard fordirecting the pin back into the slot when the drivin member is re- Aversely rotated to elevate t e s leeve.

26. A lifting jack comprising a hollow standard, a rotatable interiorly'threaded driving member mounted in the standard, an exteriorly threadedsleeve meshing 'within 'the driving member and havingan interiorlythreaded portionin its upper end, a'screw l meshing Within this latterthreaded portion lstandard havin y pin ravels during the verticalmovement of and adaptedto carrythe load to be lifted at its upper end, apin projecting from the lower portion of the sleeve, the bore of the avertical slot in which the the sleeve, the bore of the standardhavingenlarged portions adjacent the upper and lower ends of the S'tandard inwhich the pin "can vfreely rotate after leaving the guide slot, wherebythe sleeve may rotate with the 'driving member when at either limit ofits vertical 4movement. Y

27. A lifting jack comprising a hollow standard, a rotatable interiorlythreaded driving member mounted in the standard, an exteriorly threadedsleeve meshing within the driving member and having an interiorlythreaded portion in its upper end, a screw meshing within this latterthreaded portion and adapted to carry. the load to be lifted` at itsupper end, a pin projecting from the lower portion of the sleeve, thebore of the standard having a vertical slotin which the pin travelsduri'ngthev vertical movement of the sleeve, the bore of the standardhaving enlarged portions adjacent'the upper and v .lower ends of thestandard in which the pin can tfreely rotate afterv leaving the gluideslot, whereby the sleeve may' rotate wit the i driving member when ateither limit of its vertical increment, and meanswithin the endsof thestandard for directing the pin back into-the guide slot when the sleeveis again moved vertically in either direction.

MAURICE F. BERNSON.

